CN119340774A - Fiber laser and green light laser device - Google Patents
Fiber laser and green light laser device Download PDFInfo
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- CN119340774A CN119340774A CN202411447293.8A CN202411447293A CN119340774A CN 119340774 A CN119340774 A CN 119340774A CN 202411447293 A CN202411447293 A CN 202411447293A CN 119340774 A CN119340774 A CN 119340774A
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- 239000000835 fiber Substances 0.000 title claims abstract description 160
- 239000013307 optical fiber Substances 0.000 claims abstract description 47
- 239000013078 crystal Substances 0.000 claims description 27
- 238000005253 cladding Methods 0.000 claims description 16
- 230000010287 polarization Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000005086 pumping Methods 0.000 abstract description 6
- 230000009022 nonlinear effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000002310 reflectometry Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000012994 industrial processing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- VCZFPTGOQQOZGI-UHFFFAOYSA-N lithium bis(oxoboranyloxy)borinate Chemical compound [Li+].[O-]B(OB=O)OB=O VCZFPTGOQQOZGI-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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- 230000035515 penetration Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
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Abstract
本发明实施例公开了一种光纤激光器及绿光激光装置。光纤激光器包括种子源和至少一级光纤放大器；种子源包括第一泵浦源、第一泵浦合束器、第一光纤布拉格光栅、第一掺镱光纤、第二光纤布拉格光栅和第二掺镱光纤；光纤放大器包括第二泵浦源、第二泵浦合束器和第三掺镱光纤；第二泵浦源包括第三泵浦源、第三泵浦合束器、第三光纤布拉格光栅、第四掺镱光纤和第四光纤布拉格光栅。本发明实施例提供的光纤激光器采用级联泵浦技术，有效地提升了窄线宽光纤激光器输出基频激光的功率和亮度，显著降低了基频激光器的非线性效应和光纤的热负载，显著提升了基频激光的光束质量和输出功率，为更高的绿光输出打下基础。
The embodiment of the present invention discloses a fiber laser and a green light laser device. The fiber laser includes a seed source and at least one fiber amplifier; the seed source includes a first pump source, a first pump combiner, a first fiber Bragg grating, a first ytterbium-doped fiber, a second fiber Bragg grating, and a second ytterbium-doped fiber; the fiber amplifier includes a second pump source, a second pump combiner, and a third ytterbium-doped fiber; the second pump source includes a third pump source, a third pump combiner, a third fiber Bragg grating, a fourth ytterbium-doped fiber, and a fourth fiber Bragg grating. The fiber laser provided by the embodiment of the present invention adopts cascade pumping technology, which effectively improves the power and brightness of the fundamental frequency laser output by the narrow linewidth fiber laser, significantly reduces the nonlinear effect of the fundamental frequency laser and the thermal load of the optical fiber, significantly improves the beam quality and output power of the fundamental frequency laser, and lays the foundation for higher green light output.
Description
Technical Field
The invention relates to the technical field of laser, in particular to an optical fiber laser and a green laser device.
Background
Copper material is one of the most widely used metallic materials for modern industrial processing. The copper industry chain terminal demand structure covers more than 30 subdivision industries such as aerospace, high-speed trains, intelligent terminal products, electronic communication, automobiles and the like, and is a main wind vane for high-end industrial application. At present, the infrared fiber laser with the wave band of 1000nm used on a large scale has the defects of large splashing, uncontrollable penetration and the like in the processing of copper materials because of weaker absorption of copper. At room temperature, the absorptivity of copper to near infrared wavelength (about 1000 nm) is less than 5%, so that the efficiency of processing copper materials by infrared light is extremely low, 95% of laser light can be reflected, meanwhile, the laser can be damaged, and the absorptivity of copper to green light wavelength (515 nm-532 nm) is more than 40%. The selectivity of the material itself to the laser wavelength determines that the most desirable wavelength for precision machining of highly reflective materials is short wavelengths (700 nm).
For laser with green light wavelength, the laser is usually generated in a frequency doubling mode, and 532nm frequency doubling laser can be generated after frequency doubling is performed by using 1064nm fundamental frequency laser, but the 1064nm laser in the prior art has the problems of poor beam quality and low output power, and is difficult to realize high-power and high-efficiency frequency doubling laser output.
Disclosure of Invention
The embodiment of the invention provides an optical fiber laser and a green light laser device, wherein the optical fiber laser adopts a cascade pumping technology, so that the power and the brightness of the fundamental frequency laser output by a narrow linewidth optical fiber laser are effectively improved, the nonlinear effect of the fundamental frequency laser and the thermal load of an optical fiber are obviously reduced, the beam quality and the output power of the fundamental frequency laser are obviously improved, a foundation is laid for higher green light output, and the green light laser output with high frequency doubling efficiency, high brightness, narrow linewidth, small quantum defect, low optical fiber thermal load and high Transverse Mode Instability (TMI) threshold value is realized.
According to an aspect of the present invention, there is provided a fiber laser comprising a seed source and at least one stage of a fiber amplifier;
the seed source comprises a first pump source, a first pump beam combiner, a first fiber Bragg grating, a first ytterbium-doped fiber, a second fiber Bragg grating and a second ytterbium-doped fiber which are sequentially connected, the first fiber Bragg grating, the first ytterbium-doped fiber and the second fiber Bragg grating form a first resonant cavity, first pump light output by the first pump source enters the first resonant cavity after passing through the first pump beam combiner, part of the first pump light enters the second ytterbium-doped fiber after passing through the first resonant cavity, and seed light output by the first resonant cavity is output to the fiber amplifier after being preamplified by the second ytterbium-doped fiber;
The optical fiber amplifier comprises a second pump source, a second pump beam combiner and a third ytterbium-doped optical fiber, wherein the output end of the second pump source is connected with the pump input end of the second pump beam combiner, the output end of the seed source is connected with the seed light input end of the second pump beam combiner, and the output end of the second pump beam combiner is connected with the first end of the third ytterbium-doped optical fiber;
the second pump source comprises a third pump source, a third pump beam combiner, a third fiber Bragg grating, a fourth ytterbium-doped fiber and a fourth fiber Bragg grating, wherein the output end of the third pump source is connected with the pump input end of the third pump beam combiner, the output end of the third pump beam combiner is connected with the first end of the third fiber Bragg grating, the second end of the third fiber Bragg grating is connected with the first end of the fourth ytterbium-doped fiber, the second end of the fourth ytterbium-doped fiber is connected with the first end of the fourth fiber Bragg grating, the third fiber Bragg grating, the fourth ytterbium-doped fiber and the fourth fiber Bragg grating form a second resonant cavity, third pump light output by the third pump source is incident into the second resonant cavity after passing through the third pump beam combiner, and the wavelength of the first pump light and the wavelength of the third pump light are smaller than that of the second pump light, and the wavelength of the third pump light is smaller than that of the second pump light.
Optionally, the optical fiber amplifier further comprises an isolator, wherein the input end of the isolator is connected with the output end of the seed source, and the output end of the isolator is connected with the input end of the optical fiber amplifier.
Optionally, the optical fiber amplifier further includes a first cladding light stripper, and an input end of the first cladding light stripper is connected to the second end of the third ytterbium-doped optical fiber.
Optionally, the seed source further comprises a second clad optical stripper, an input end of the second clad optical stripper being connected to a second end of the second ytterbium-doped fiber.
Optionally, the fiber laser further comprises a QBH fiber joint arranged at the output end of the fiber laser.
Optionally, the first pump source and the third pump source are semiconductor lasers with output wavelength of 976nm, the second pump source is an optical fiber laser with output wavelength of 1018nm and output power of 1300-1500 w, and the seed source is an optical fiber laser with output wavelength of 1064nm and output power of 20-30 w.
According to another aspect of the present invention, there is provided a green laser device including a fundamental frequency light source, a beam adjustment module, a frequency doubling crystal, and an output module, the fundamental frequency light source being the above-mentioned fiber laser, the beam adjustment module including a lens and a half-wave plate, the output module including a dichroic mirror;
The fundamental frequency light source outputs a fundamental frequency light beam of 1064nm, the fundamental frequency light beam is converged by the lens and enters the frequency doubling crystal to be doubled after the polarization state is regulated by the half wave plate, the frequency doubling light beam of 532nm is output, and the dichroic mirror is used for splitting the frequency doubling light beam and part of the fundamental frequency light beam to different transmission directions.
Optionally, the first output end of the dichroic mirror outputs the frequency multiplication light beam, the second output end of the dichroic mirror outputs the fundamental frequency light beam, the output module further includes a reflecting mirror disposed at the first output end of the dichroic mirror and a light absorbing unit disposed at the second output end of the dichroic mirror, the reflecting mirror is used for changing the transmission direction of the frequency multiplication light beam, and the light absorbing unit is used for absorbing the fundamental frequency light beam without frequency multiplication.
Optionally, the beam adjusting module includes a collimating lens, a half-wave plate, and a focusing lens, where the collimating lens, the half-wave plate, and the focusing lens are sequentially arranged along a direction of the fundamental frequency light source pointing to the frequency doubling crystal, the fundamental frequency light beam is collimated by the collimating lens, the half-wave plate rotates a polarization direction of the fundamental frequency light beam, and the focusing lens focuses inside the frequency doubling crystal.
Optionally, the frequency doubling crystal also comprises a temperature control module, and the frequency doubling crystal is fixedly arranged on the temperature control module.
The optical fiber laser comprises a seed source and at least one stage of optical fiber amplifier, wherein the seed source comprises a first pump source, a first pump beam combiner, a first fiber Bragg grating, a first ytterbium-doped fiber, a second fiber Bragg grating and a second ytterbium-doped fiber, the first fiber Bragg grating, the first ytterbium-doped fiber and the second fiber Bragg grating form a first resonant cavity, first pump light output by the first pump source enters the first resonant cavity after passing through the first pump beam combiner, part of the first pump light enters the second ytterbium-doped fiber after passing through the first resonant cavity, seed light output by the first resonant cavity is output to the optical fiber amplifier after being preamplified by the second ytterbium-doped fiber, the fiber amplifier comprises a second pump source, a second pump beam combiner and a third ytterbium-doped fiber, the second fiber Bragg grating and the fourth fiber Bragg grating, the third pump light output by the third fiber Bragg grating, the third pump light and the fourth ytterbium-doped fiber Bragg grating form a third pump source, the second pump light with the wavelength smaller than the second pump light output by the second pump light with the wavelength smaller than the first pump light, and the second pump light output by the second pump light with the wavelength smaller than the second pump light output by the second pump light. The second pump light with the middle wavelength is generated by the third pump light with the short wavelength and is used as pump light amplification seed light of the optical fiber amplifier, namely, the cascade pumping technology is adopted to improve the power and the brightness of the laser light with the narrow linewidth output fundamental frequency of the optical fiber laser, the nonlinear effect of the laser light with the fundamental frequency and the heat load of the optical fiber are obviously reduced, the beam quality and the output power of the laser light with the fundamental frequency are obviously improved, a foundation is laid for higher green light output, and green light laser output with high frequency doubling efficiency, high brightness, narrow linewidth, small quantum loss, low optical fiber heat load and high TMI threshold value is realized.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an optical fiber laser according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a seed source according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second pump source according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another optical fiber laser according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another fiber laser according to an embodiment of the present invention;
FIG. 6 is a schematic view of another seed source according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another fiber laser according to an embodiment of the present invention;
Fig. 8 is a block diagram of a green laser device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a green laser device according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of an optical fiber laser according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a seed source according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of a second pump source according to an embodiment of the present invention. Referring to fig. 1, a fiber laser according to an embodiment of the present invention includes a seed source 10 and at least one primary fiber amplifier 20 (the primary fiber amplifier is taken as an example in fig. 1 and is not limited to the embodiment of the present invention). The seed source 10 is configured to output seed light, for example, the seed light may be 1064nm infrared light as fundamental frequency light for generating 532 nm. In one embodiment, the seed source 10 is an optical fiber laser with an output wavelength of 1064nm and an output power of 20W-30W. Referring to fig. 2, the seed source 10 includes a first pump source 11 (two first pump sources 11 are taken as an example in fig. 2, at least one of the first pump sources 11 may be a plurality of first pump sources, and is not limited to the embodiment of the present invention), a first pump combiner 12, a first fiber bragg grating 13, a first ytterbium-doped fiber 14, a second fiber bragg grating 15, and a second ytterbium-doped fiber 16, which are sequentially connected. Specifically, the output end of the first pump source 11 is connected to the pump input end of the first pump beam combiner 12, the output end of the first pump beam combiner 12 is connected to the first end of the first fiber bragg grating 13, the second end of the first fiber bragg grating 13 is connected to the first end of the first ytterbium-doped fiber 14, the second end of the first ytterbium-doped fiber 14 is connected to the first end of the second fiber bragg grating 15, the second end of the second fiber bragg grating 15 is connected to the first end of the second ytterbium-doped fiber 16, the first fiber bragg grating 13, the first ytterbium-doped fiber 14 and the second fiber bragg grating 15 form a first resonant cavity, the first pump light output by the first pump source 11 enters the first resonant cavity after passing through the first pump beam combiner 12, part of the first pump light enters the second ytterbium-doped fiber 16 after passing through the first resonant cavity, and the seed light output by the first resonant cavity is output to the fiber amplifier 20 after being pre-amplified by the second ytterbium-doped fiber 16.
The first fiber bragg grating 13 may be a high-reflectivity grating, for example, the reflectivity is greater than or equal to 99.5%, the second fiber bragg grating 15 may be a low-reflectivity grating, for example, the reflectivity is 10%, the central wavelengths of the first fiber bragg grating 13 and the second fiber bragg grating 15 are 1064nm, the first fiber bragg grating 13 and the second fiber bragg grating 15 construct an ultra-short first resonant cavity, the line width of the seed source 10 mainly has two influencing factors, one is the 3dB bandwidth of the fiber bragg grating, the fixed parameter (0.05 nm) is generally used, the other influencing factor is the length of the fiber, the shorter the line width is, the smaller the line width is, but the fiber length cannot be infinitely reduced, the output power of the seed laser is influenced, the theoretical length of the first ytterbium-doped fiber 14 can be 1.5m to 3.0m, and the seed light with a narrow line width (< 0.2 nm) can be output. Optionally, the first pump source 11 may be a semiconductor laser with an output wavelength of 976nm, the unabsorbed first pump light may be reabsorbed by the second ytterbium-doped optical fiber 16 outside the cavity, so as to realize preamplification of seed light, thereby improving the output power of the whole seed, realizing the light output of seed light with a narrow line width of about 20w to 30w, and controlling the output line width within 0.1 nm.
With continued reference to fig. 1, the optical fiber amplifier 20 includes a second pump source 21 (two second pump sources 21 are taken as an example in fig. 1, at least one of the second pump sources 21 may be a plurality of second pump sources, and not limited to the embodiment of the present invention), a second pump beam combiner 22, and a third ytterbium-doped optical fiber 23, an output end of the second pump source 21 is connected to a pump input end of the second pump beam combiner 22, an output end of the seed source 10 is connected to a seed optical input end of the second pump beam combiner 22, and an output end of the second pump beam combiner 22 is connected to a first end of the third ytterbium-doped optical fiber 23.
The third ytterbium-doped fiber 23 may be an ytterbium-doped fiber with a core diameter of 25 μm and a cladding diameter of 400 μm, and the power of the seed light is amplified by the fiber amplifier 20, so that a high-power 1064nm laser output can be realized.
Referring to fig. 3, the second pump source 21 includes a third pump source 211 (two third pump sources 211 are taken as an example in fig. 3, at least one of the third pump sources 211 may be a plurality of third pump sources, but not limited to the embodiment of the present invention), a third pump beam combiner 212, a third fiber bragg grating 213, a fourth ytterbium-doped fiber 214 and a fourth fiber bragg grating 215, an output end of the third pump source 211 is connected to a pump input end of the third pump beam combiner 212, an output end of the third pump beam combiner 212 is connected to a first end of the third fiber bragg grating 213, a second end of the third fiber bragg grating 213 is connected to a first end of the fourth ytterbium-doped fiber 214, a second end of the fourth ytterbium-doped fiber 214 is connected to a first end of the fourth fiber bragg grating 215, the third fiber bragg grating 213, the fourth ytterbium-doped fiber 214 and the fourth fiber bragg grating 215 form a second resonant cavity, and the third pump light output by the third pump source 211 is transmitted to the second pump cavity after passing through the third pump beam combiner 212, and the pump light with a small wavelength at the second pump wavelength.
Optionally, the third pump source 211 may be a semiconductor laser with an output wavelength of 976nm, the third fiber bragg grating 213 may be a high-reflectivity grating, the fourth fiber bragg grating 215 may be a low-reflectivity grating, the central wavelengths of the third fiber bragg grating 213 and the fourth fiber bragg grating 215 are 1018nm, and the fourth ytterbium-doped fiber 214 may be an ytterbium-doped fiber with a fiber core diameter of 30 μm and a cladding diameter of 400 μm, so as to form a fiber laser with an output wavelength of 1018nm and an output power of 1300w to 1500 w.
According to the technical scheme, first, second pump light with intermediate wavelength (1018 nm) is generated through third pump light with short wavelength (976 nm), the second pump light is used as pump light of an optical fiber amplifier to amplify seed light (1064 nm), namely, a cascade pumping technology is adopted to improve the power and brightness of a narrow-linewidth optical fiber laser for outputting fundamental frequency laser, nonlinear effect of the fundamental frequency laser and the heat load of an optical fiber are remarkably reduced, the beam quality and output power of the fundamental frequency laser are remarkably improved, a foundation is laid for higher green light output, and green light laser output with high frequency doubling efficiency, high brightness, narrow linewidth, small quantum loss, low optical fiber heat load and high TMI threshold value is achieved.
Fig. 4 is a schematic structural diagram of another optical fiber laser according to an embodiment of the present invention, and referring to fig. 4, optionally, the optical fiber laser further includes an isolator 30, an input end of the isolator 30 is connected to an output end of the seed source 10, and an output end of the isolator 30 is connected to an input end of the optical fiber amplifier 20.
By providing the isolator 30, damage to devices within the seed source 10 due to return light during amplification can be avoided.
Fig. 5 is a schematic structural diagram of another optical fiber laser according to an embodiment of the present invention, and referring to fig. 5, the optical fiber amplifier 20 optionally further includes a first cladding light stripper 24, where an input end of the first cladding light stripper 24 is connected to a second end of a third ytterbium-doped optical fiber 23.
The first cladding light stripper 24 is used for absorbing the residual second pump light to improve the beam quality of the output light.
Fig. 6 is a schematic view of another seed source according to an embodiment of the present invention, and referring to fig. 6, optionally, the seed source 10 further includes a second cladding light stripper 17, and an input end of the second cladding light stripper 17 is connected to a second end of the second ytterbium-doped fiber 16.
The second cladding light stripper 17 is used for absorbing the residual first pump light to improve the beam quality of the seed light.
Optionally, with continued reference to fig. 3, the second pump source 21 further includes a third cladding light stripper 216, and an input end of the third cladding light stripper 216 is connected to the second end of the fourth fiber bragg grating 215 for absorbing the residual third pump light.
Fig. 7 is a schematic structural diagram of another fiber laser according to an embodiment of the present invention, and referring to fig. 7, optionally, the fiber laser further includes a QBH fiber optic connector 40 disposed at an output end of the fiber laser.
QBH (Quartz Block Head) the fiber optic connector 40 employs swedish Optoskand AB company Quartz Block related patent technology and Mode Stripping (Mode Stripping) technology, and the fiber optic connector with built-in water cooling mechanism can handle extremely high laser power transmission (> 5kW average power, MW level pulse peak power) and can withstand extremely high echo reflection.
Fig. 8 is a block diagram of a green laser device according to an embodiment of the present invention, and referring to fig. 8, the green laser device includes a fundamental frequency light source 100, a beam adjustment module 200, a frequency doubling crystal 300, and an output module 400, where the fundamental frequency light source 100 is any one of the fiber lasers provided in the foregoing embodiments, the beam adjustment module 200 includes a lens and a half-wave plate, the output module 400 includes a dichroic mirror, the fundamental frequency light source 100 outputs a fundamental frequency beam of 1064nm, and after polarization state adjustment by the lens, the fundamental frequency light source is incident to the frequency doubling crystal 300 to double frequency and output a frequency doubling beam of 532nm, and the dichroic mirror is used to split the frequency doubling beam and a part of the fundamental frequency beam to different transmission directions.
The fundamental frequency light source 100 is an optical fiber laser provided in the above embodiment, and outputs a fundamental frequency light beam with high power and high beam quality by using a cascade pumping technology, the beam adjusting module 200 adjusts the spot size and polarization state of the fundamental frequency light beam, the fundamental frequency light beam is converged to the frequency doubling crystal 300 to generate frequency doubling, the frequency doubling crystal 300 can be lithium triborate LBO, the LBO crystal is a negative biaxial crystal, and has the advantages of wide band range, high efficiency, high damage threshold and the like, and the output module 400 is used for separating the frequency doubling light beam from the fundamental frequency light beam and outputting a high-quality frequency doubling light beam.
The embodiment of the invention provides a scheme for realizing high-power polarization-maintaining narrow-linewidth 1064nm laser with high beam quality by utilizing a main amplification technology of an optical fiber Bragg grating and cascade pumping, and outputting narrow-linewidth green light with high beam quality and linewidth less than or equal to 0.2nm after frequency multiplication. The main amplification technology of the fiber Bragg grating and the cascade pump can remarkably improve the beam quality and the linewidth performance of fundamental frequency laser after passing through an amplification stage, improve the stability of the fundamental frequency laser, and provide a good foundation for the output of high-power green light. The fundamental frequency light is collimated and focused by a system and then subjected to frequency doubling optimization, so that the frequency doubling efficiency of the laser is adjusted to an optimal state. The laser beam source has the main advantages of realizing the green laser output with high beam quality and narrow linewidth less than or equal to 0.2nm, having higher laser power stability and higher beam quality, having better frequency doubling efficiency for the whole green laser system, and being capable of realizing industrial processing applications such as laser welding or 3D printing.
Fig. 9 is a schematic structural diagram of a green laser device according to an embodiment of the present invention, referring to fig. 9, optionally, a first output end of a dichroic mirror 401 outputs a frequency-doubled light beam, a second output end of the dichroic mirror 401 outputs a fundamental frequency light beam, an output module 400 further includes a reflecting mirror 402 disposed at the first output end of the dichroic mirror 401 and a light absorbing unit 403 disposed at the second output end of the dichroic mirror 401, a reflecting mirror 420 is used for changing a transmission direction of the frequency-doubled light beam, and the light absorbing unit 403 is used for absorbing the fundamental frequency light beam where no frequency doubling occurs.
It is understood that the frequency doubling efficiency of the frequency doubling crystal 300 may not reach one hundred percent, that is, a portion 1064nm fundamental frequency beam cannot be absorbed by the frequency doubling crystal 300, and the light absorbing unit 403 may be configured to absorb and convert the remaining 1064nm fundamental frequency beam into heat energy. In practice, the angle between the dichroic mirror 401 and the reflecting mirror 402 and the optical axis may be 45 °.
With continued reference to fig. 9, the beam adjustment module 200 includes an optional collimating lens 201, a half-wave plate 201, and a focusing lens 203, where the collimating lens 201, the half-wave plate 202, and the focusing lens 203 are sequentially arranged along the direction of the fundamental frequency light source 100 pointing to the frequency doubling crystal 300, the fundamental frequency light beam is collimated by the collimating lens 201, the half-wave plate 202 rotates the polarization direction of the fundamental frequency light beam, and the focusing lens 203 focuses inside the frequency doubling crystal 300.
With continued reference to fig. 9, the green laser apparatus optionally further includes a temperature control module 500, the frequency doubling crystal 300 is fixedly disposed on the temperature control module 500, and the temperature control module 500 is used for maintaining the temperature stability of the frequency doubling crystal 300 to maintain the optimal frequency doubling efficiency.
It will be appreciated that to frequency multiply the frequency doubling crystal 300, the fundamental frequency beam needs to be converged on the frequency doubling crystal 300, and the phase matching condition for generating frequency multiplication needs to be satisfied, the collimating lens 201 and the focusing lens 203 are used to converge the beam, the half wave plate 202 is used to adjust the polarization state to satisfy the phase matching condition, and during the adjustment of the device, the frequency doubling crystal 300 is fixedly disposed in the temperature control module 500 (in other embodiments, the temperature control module 500 may be disposed on the surface of the temperature control module 500, which is not limited by the embodiments of the present invention) to maintain the optimal frequency doubling efficiency by adjusting the position of the frequency doubling crystal 300 to achieve the optimal frequency doubling efficiency.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A fiber laser comprising a seed source and at least one stage of fiber amplifier;
the seed source comprises a first pump source, a first pump beam combiner, a first fiber Bragg grating, a first ytterbium-doped fiber, a second fiber Bragg grating and a second ytterbium-doped fiber which are sequentially connected, the first fiber Bragg grating, the first ytterbium-doped fiber and the second fiber Bragg grating form a first resonant cavity, first pump light output by the first pump source enters the first resonant cavity after passing through the first pump beam combiner, part of the first pump light enters the second ytterbium-doped fiber after passing through the first resonant cavity, and seed light output by the first resonant cavity is output to the fiber amplifier after being preamplified by the second ytterbium-doped fiber;
The optical fiber amplifier comprises a second pump source, a second pump beam combiner and a third ytterbium-doped optical fiber, wherein the output end of the second pump source is connected with the pump input end of the second pump beam combiner, the output end of the seed source is connected with the seed light input end of the second pump beam combiner, and the output end of the second pump beam combiner is connected with the first end of the third ytterbium-doped optical fiber;
the second pump source comprises a third pump source, a third pump beam combiner, a third fiber Bragg grating, a fourth ytterbium-doped fiber and a fourth fiber Bragg grating, wherein the output end of the third pump source is connected with the pump input end of the third pump beam combiner, the output end of the third pump beam combiner is connected with the first end of the third fiber Bragg grating, the second end of the third fiber Bragg grating is connected with the first end of the fourth ytterbium-doped fiber, the second end of the fourth ytterbium-doped fiber is connected with the first end of the fourth fiber Bragg grating, the third fiber Bragg grating, the fourth ytterbium-doped fiber and the fourth fiber Bragg grating form a second resonant cavity, third pump light output by the third pump source is incident into the second resonant cavity after passing through the third pump beam combiner, and the wavelength of the first pump light and the wavelength of the third pump light are smaller than that of the second pump light, and the wavelength of the third pump light is smaller than that of the second pump light.
2. The fiber laser of claim 1, further comprising an isolator having an input connected to the output of the seed source and an output connected to the input of the fiber amplifier.
3. The fiber laser of claim 1, wherein the fiber amplifier further comprises a first cladding light stripper, an input end of the first cladding light stripper being connected to a second end of the third ytterbium-doped fiber.
4. The fiber laser of claim 1, wherein the seed source further comprises a second cladding light stripper, an input end of the second cladding light stripper being connected to a second end of the second ytterbium-doped fiber.
5. The fiber laser of claim 1, further comprising a QBH fiber splice disposed at an output of the fiber laser.
6. The fiber laser of claim 1, wherein the first pump source and the third pump source are semiconductor lasers with output wavelength of 976nm, the second pump source is a fiber laser with output wavelength of 1018nm and output power of 1300 w-1500 w, and the seed source is a fiber laser with output wavelength of 1064nm and output power of 20 w-30 w.
7. The green laser device is characterized by comprising a fundamental frequency light source, a beam adjusting module, a frequency doubling crystal and an output module, wherein the fundamental frequency light source is the fiber laser according to any one of claims 1-6, the beam adjusting module comprises a lens and a half wave plate, and the output module comprises a dichroic mirror;
The fundamental frequency light source outputs a fundamental frequency light beam of 1064nm, the fundamental frequency light beam is converged by the lens and enters the frequency doubling crystal to be doubled after the polarization state is regulated by the half wave plate, the frequency doubling light beam of 532nm is output, and the dichroic mirror is used for splitting the frequency doubling light beam and part of the fundamental frequency light beam to different transmission directions.
8. The green laser device according to claim 7, wherein the first output end of the dichroic mirror outputs the frequency-doubled light beam, the second output end of the dichroic mirror outputs the fundamental frequency light beam, and the output module further comprises a reflecting mirror provided at the first output end of the dichroic mirror and a light absorbing unit provided at the second output end of the dichroic mirror, the reflecting mirror being configured to change a transmission direction of the frequency-doubled light beam, the light absorbing unit being configured to absorb the fundamental frequency light beam for which frequency doubling does not occur.
9. The green laser device according to claim 7, wherein the beam adjustment module includes a collimator lens, a half-wave plate, and a focusing lens, the collimator lens, the half-wave plate, and the focusing lens are arranged in this order along a direction in which the fundamental frequency light source is directed toward the frequency doubling crystal, the fundamental frequency light beam is collimated by the collimator lens, the half-wave plate rotates a polarization direction of the fundamental frequency light beam, and the focusing lens focuses inside the frequency doubling crystal.
10. The green laser device according to claim 7, further comprising a temperature control module, wherein the frequency doubling crystal is fixedly disposed on the temperature control module.
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| CN202411447293.8A CN119340774A (en) | 2024-10-16 | 2024-10-16 | Fiber laser and green light laser device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202411447293.8A CN119340774A (en) | 2024-10-16 | 2024-10-16 | Fiber laser and green light laser device |
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| CN119340774A true CN119340774A (en) | 2025-01-21 |
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